Am i pregnant? experience some nausea at times and...

So here's my story...

my last period was on June 6th...my ovulation date was on the 27th, my boyfriend and I had unprotected sex with him ejaculating inside of me on the 29th. I'm expected to start my next period on July 11th but today being the 7th I woke up with mild cramps mostly on my right side and started bleeding a little. Could this be implantation bleeding or am I having my period early? I am also experience some nausea at times and hungry more also some head aches. I was planning on taking a hpt on Wednesday the 11th....should I still take it or not? If it's my period can I still be pregnant??? Anyone help please I need to know asap to start caring for the baby if I am pregnant!!! Thank you:)